* {
	margin: 0;
	padding: 0;
	border: 0;
}
.box {
	position: absolute;
	width: 100%;
	height: 100%;
	background: url(../image/index/2稿@2x.png) no-repeat;
	background-size: cover;
}
.btn {
	width: 200px;
	height: 50px;
	text-decoration: none;
	text-align: center;
	line-height: 50px;
	font-size: 16px;
	color: #472500;
	font-weight: bold;
	background: no-repeat;
	background-size: 100% 100%;
	outline: none;
	position: absolute;
	z-index: 999;
	left: 50%;
	top: 50%;
	animation:loaddown 1s;
	margin-left: -100px;
	margin-top: -50px;
}

@keyframes loaddown{
	from{ top: -10%;}
	to{top: 50%;}
}